Reaction processes of the titanium matrix composites fabricated from Ti-Al-B₂O₃ system

Abstract

Titanium matrix composites reinforced with α-Al₂O₃ and TiB₂ particles were fabricated by in situ synthesis from a Ti-Al-B₂O₃ system. The reaction processes and microstructure were analyzed by using differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the reactions in the Ti-Al-B₂O₃ system can occur spontaneously and consist of three steps: 1) 15Al + 7B₂O₃ → 7α-Al₂O₃ + AlB₁₂ + 2B; 2) 14B + 2Al → AlB₁₂ + AlB₂ and 3) 7Ti + AlB₁₂ + AlB₂ → 7TiB₂ + 2Al. The final reinforcements were composed of α-Al₂O₃ and TiB₂ particles, which were uniformly distributed in the titanium matrix.

Keywords

titanium matrix composites / in situ reaction / differential scanning calorimetry(DSC) / scanning electron microscopy (SEM) / X-ray diffraction (XRD)

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